Open AccessVariable-focus lens with 1-kHz bandwidth
Author(s) -
Hiromasa Oku,
Koichi Hashimoto,
Masatoshi Ishikawa
Publication year - 2004
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.12.002138
Subject(s) - optics , bandwidth (computing) , actuator , lens (geology) , amplifier , focal length , ranging , materials science , stack (abstract data type) , physics , computer science , engineering , telecommunications , electrical engineering , programming language
This paper proposes a variable-focus lens with 1-kHz bandwidth. The lens transforms its shape rapidly using the liquid pressure generated by a piezo stack actuator. This mechanism also includes a built-in motion amplifier with high bandwidth to compensate for the short working range of the piezo stack actuator. Prototypes have been developed to validate the proposed design. A 1-kHz bandwidth of the lenses was confirmed by measuring the frequency responses. Refractive power ranging from -1/167 to 1/129 mm(-1) and a maximum resolution of 12.3 cycles/mm were attained.